Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 57666-05 found under Ring Retaining by Triumph Controls Llc. The National Stock Number assigned to this part is 5325005981774, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 57666-05.